Viewing archive of Wednesday, 31 July 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Jul 31 1231 UTC

SIDC Forecast

Solar flares

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
31 Jul 2019	066	014
01 Aug 2019	066	007
02 Aug 2019	066	007

Bulletin

No active regions visible on the Sun. No flares observed, nor expected.

No Earth directed CMEs in past 24 h. Solar protons have remained at background levels over the past 24 hours.

The solar wind speed is at 460 km/s with interplanetary magnetic field magnitude of 7 nT. The solar wind speed increased steadily since July 30 around noon, marking the (early) arrival of the expected high speed stream from a negative polarity coronal hole. With speeds close to 500 km/s and interplanetary magnetic fields up to 11 nT, active geomagnetic conditions were observed locally (K Dourbes = 4) and unsettled at planetary levels (Kp = 3). More active periods are possible in the next 48 h.

Today's estimated international sunspot number (ISN): 000, based on 22 stations.

Solar indices for 30 Jul 2019

Wolf number Catania	000
10cm solar flux	066
AK Chambon La Forêt	016
AK Wingst	011
Estimated Ap	010
Estimated international sunspot number	000 - Based on 35 stations

Noticeable events summary

Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive

All times in UTC

<< Go to daily overview page